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These tags delimit a code declaration block. The server saves up any script statements you enclose with these tags and runs them when it encounters the end of the Web page. Few, if any, developers use these tags in ASP pages. This is because any code the tags enclose runs after the body of the page has left the server, and that s too late to customize the page.
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These tags delimit a code render block. Any statements they enclose execute immediately. Virtually all real-world ASP code resides between such tags.
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Each ASP page executes as one program. This means that in general, any variables you declare in one <% %> block are available in all subsequent <% %> blocks. (Of course, any variables you declare within a subroutine or function are available only within that subroutine or function.) The default and most popular programming language for ASP pages is VBScript. Microsoft also supports its implementation of JavaScript (called JScript) on ASP pages, and other languages such as Perl are available from third parties. Remember that the Web server executes this code and that the browser sees only the results, so there s no need to choose a server-side programming language that browsers support. Tip Server-side scripts and browser-side scripts can co-exist. There s no restriction against using server-side and browser-side scripts on the same page. The two script types are identified differently in the HTML, allowing the server-side script processor to pass browser-side script statements to the browser unmodified. Server-side scripts can even generate browser-side scripts by writing the necessary statements to the outbound HTML stream.
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Part 11: Working Directly with Code
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Scripting Web Pages on the Server Whenever an ASP page is running, it automatically has access to the five objects listed below. A high percentage of the work that ASP pages perform involves manipulation of these objects.
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Provides information about the Web visitor s current request. Sends a Web page or other response back to the Web visitor. Stores information about multiple requests from the same Web visitor. Provides access to information and resources located on the Web server.
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Application
Provides shared information for all visitors using the same application (that is, using ASP pages in the same designated folder tree).
VBScript has no built-in capability to access databases, read and write files, or send e-mail. To perform these tasks, ASP programmers generally use objects from these collections:
ActiveX Data Objects (ADO)
Objects from this collection access and update Objects from this collection access and update files on Objects from this collection send e-mail.
databases.
Scripting.FileSystemObject
the Web server.
Collaboration Data Objects (CDO)
For information about configuring Microsoft Web servers to run scripts, see Appendix O, Installing and Configuring a Web Server.
Changing Content with ASP Code (Coding Example 1)
This section will illustrate a server-side solution to one of the problems posed in the previous chapter the problem of displaying New! and Upd! icons for a specified period of time. This solution uses VBScript and the ASP feature of IIS. Figure 42-1 shows the results. The code to set the first item s picture is shown here:
1 2 3 4 5 6 <% maxdays = 14 %> <% If (now - #5/15/2003# < maxdays) Then %> <img src="../images/new.gif"> <% Else %> <img src="../images/cyanball.gif"> <% End If %>
42
Part 11: Working Directly with Code
Microsoft Office FrontPage 2003 Inside Out
Figure 42-1. This Web page is very similar to the page shown in Figure 41-5, but it uses server-side scripting. The file extension is .asp rather than .htm, and the page resides in an executable directory.
Four features of VBScript make this code somewhat simpler than the Java Script version:
The now function in VBScript returns the current date and time. Dates and times in VBScript are stored as whole numbers for days and fractions of a
day for time 6:00 AM is 0.25, 12:00 noon is 0.5, and 6:00 PM is 0.75, for example. Subtracting two dates immediately provides the difference in days.
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